// Copyright 2014 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#include "base/threading/platform_thread.h"

#include <errno.h>
#include <sched.h>
#include <stddef.h>

#include "base/lazy_instance.h"
#include "base/logging.h"
#include "base/threading/platform_thread_internal_posix.h"
#include "base/threading/thread_id_name_manager.h"
#include "base/tracked_objects.h"
#include "build/build_config.h"

#if !defined(OS_NACL)
#include <pthread.h>
#include <sys/types.h>
#include <unistd.h>
#endif

namespace base {

namespace internal {

    namespace {
#if !defined(OS_NACL)
        const struct sched_param kRealTimePrio = { 8 };
#endif
    } // namespace

    const ThreadPriorityToNiceValuePair kThreadPriorityToNiceValueMap[4] = {
        { ThreadPriority::BACKGROUND, 10 },
        { ThreadPriority::NORMAL, 0 },
        { ThreadPriority::DISPLAY, -6 },
        { ThreadPriority::REALTIME_AUDIO, -10 },
    };

    bool SetCurrentThreadPriorityForPlatform(ThreadPriority priority)
    {
#if !defined(OS_NACL)
        return priority == ThreadPriority::REALTIME_AUDIO && pthread_setschedparam(pthread_self(), SCHED_RR, &kRealTimePrio) == 0;
#else
        return false;
#endif
    }

    bool GetCurrentThreadPriorityForPlatform(ThreadPriority* priority)
    {
#if !defined(OS_NACL)
        int maybe_sched_rr = 0;
        struct sched_param maybe_realtime_prio = { 0 };
        if (pthread_getschedparam(pthread_self(), &maybe_sched_rr,
                &maybe_realtime_prio)
                == 0
            && maybe_sched_rr == SCHED_RR && maybe_realtime_prio.sched_priority == kRealTimePrio.sched_priority) {
            *priority = ThreadPriority::REALTIME_AUDIO;
            return true;
        }
#endif
        return false;
    }

} // namespace internal

// static
void PlatformThread::SetName(const std::string& name)
{
    ThreadIdNameManager::GetInstance()->SetName(CurrentId(), name);
    tracked_objects::ThreadData::InitializeThreadContext(name);

#if !defined(OS_NACL)
    // On FreeBSD we can get the thread names to show up in the debugger by
    // setting the process name for the LWP.  We don't want to do this for the
    // main thread because that would rename the process, causing tools like
    // killall to stop working.
    if (PlatformThread::CurrentId() == getpid())
        return;
    setproctitle("%s", name.c_str());
#endif //  !defined(OS_NACL)
}

void InitThreading() { }

void TerminateOnThread() { }

size_t GetDefaultThreadStackSize(const pthread_attr_t& attributes)
{
#if !defined(THREAD_SANITIZER)
    return 0;
#else
    // ThreadSanitizer bloats the stack heavily. Evidence has been that the
    // default stack size isn't enough for some browser tests.
    return 2 * (1 << 23); // 2 times 8192K (the default stack size on Linux).
#endif
}

} // namespace base
